Matching Pairs Types of Barriers VocabularyOnline version Click on the box to match the correct term and definition. by Stephanie Muniz 1 dam 2 sand bags 3 levee 4 sand dune 5 sea wall a barrier that blocks flowing water or sends it in a new direction. a bank built along a river to prevent flooding bags filled with sand a wall built to protect land along the coast from erosion and flooding from the sea a hill of sand near an ocean or in a desert that is formed by the wind